package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingcart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid= BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果已经存在，数量+1
        if(list !=null &&list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
        //如果不存在，则需要插入一条购物车数据

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加的为菜品
                Dish dish=dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());


            }else{
                //本次添加的为套餐
                Long setmealId=shoppingCartDTO.getSetmealId();
                Setmeal setmeal=setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());


            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查询购物车中的物品,通过用户id
     * @return
     */
    @Override
    public List<ShoppingCart> listById() {
        //设置用户id
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list =shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 删除该用户购物车中所有数据
     */
    @Override
    public void clean() {
        //获取用户id
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.cleanByUserId(userId);
    }

    /**
     * 计算购物车中物品信息
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //获取用户id
        Long userId =BaseContext.getCurrentId();
        //将shoppingCartDTO复制给shoppingCart
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置用户id
        shoppingCart.setUserId(userId);
        //在购物车中查找该物品信息，并且获取数量
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list!=null && list.size()>0){
            ShoppingCart cart=list.get(0);
            Integer number= cart.getNumber();
            if (number==1){
                shoppingCartMapper.deleteById(cart.getId());
            }else{
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }

    }
}
